Update Templates/setup/model/env/model_test.h to match spike

[dansmathers]

updated to match changes to https://github.com/riscv-software-src/riscv-isa-sim/blob/master/arch_test_target/spike/model_test.h

update set_msw/clear_msw/set_mtimer/clear_mtimer Added ifndef to clint addresses instead of hard-coding Added clear_msw and clear mtimer